Hot-air furnace.



PATENTED MAR; 5, 1907. P.B.0DELL.

HOT AIR FURNACE. APPLICATION FILED N019, 1905.

2 SHEETS-SHEET 1.

Witnesse 7 V Inventor;

- b 1 y I I Attorneys.

rm: NLIRRIS psrmzs ca, WASHINGTON, n. c.

110.845.888. PATENTED MAR. 5,1901.

P. E. ODELL.

HOT AIR FURNACE.

APPLICATION FILED NOV. 9, 1905.

2 SHEETSSHEET 2.

msiazzz'fldell,

Witnesses Inventor,

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rm: "0km; FS'IERS co., WASHINGTON, n. c

PRESTON E. ODELL, OF ZION IJITY, ILLINOIS.

HOT-AIR FURNACE.

Specification of Letters Patent.

Patented March 5, 1907.

Application filed November 9, 1905. Serial No. 286,623

To all whom, it may concern:

Be it known that I, Pnnsrron E. ODELL, a citizen of the United States, residing at Zion City, in the county of Lake and State of Illinois, have invented a new and useful Hot- Air Furnace, of which the following is a specification.

This invention relates to hot-air furnaces.

The object of this invention is to provide a furnace which consists, primarily, of a firebox having an escape-flue. A shell constitutes a hot-air chamber and involves the said fire-box. A flue is attached to and located in said shell and detachably engages the flue of the fire-box.

In the accompanying drawings, forming a part of this specification, and in which like characters of reference indicate corresponding parts, Figure 1 is a view in vertical longitudinal section through a hot-air furnace constructed in accordance with the present invention. Fig. 2 is a view in transverse section through the furnace. Fig. 3 is a perspective detail view of the fire-box.

The furnace embodies a fire-box 1, which is, by preference. made of cast-iron, and a shell 2, constituting a hot-air chamber, the latter being removable from the fire-box at will, whereby to permit cleaning of the fire-box or the hot-air chamber. The fire-box is, by preference, constructed of cast-iron and the hot-air chamber of heavy sheet metal. Within the fire-box, as usual, are arranged gratebars 3, and these terminate with walls 4, that extend the length of the lire-box and are spaced. at such distance from the sides thereof as to permit ready passage of the heated products of combustion or of air downward around. the sides of the fire-box and beneath the bottom 5 of the same, whence they escape through a flue 6, arranged at the rear end of the chamber and out through an air duct or pipe 7 to the chimney. Within the flue is arranged a damper 8, which is operable from the exterior of the hot-air chamber by a rod 9, and this damper is adapted to control passage through an opening 10 in the rear wall of the fire-box and slightly above the walls 4, whereby the'furnace may be caused to operate either as an up or down draft burner, it being seen that when the damper is closed, or in the position shown in the floor 5 of the fire-box and the bottom 12 of the same and thence upward through the flue 6 to the chimney. When the damper is in the position indicated by dotted lines in Fig. 1,- the products of combustion will pass directly out through the opening 10, under which conditions the furnace will be an updraft one. By causing the products of combustion to travel downward between the walls 4 and the sides of the fire-box and out through the air-space 11 the cold air taken into the hot-air chamber through the baseopenings 13 will be heated on its initial intake, and by the time it has reached the top of the air-chamber it will be highly heated. As shown in Fig. 2, the cold air will contact with the entire exterior surface of the the box before escaping to the fines 14:, with which the pipes leading to the different rooms are connected as usual. As will be seen by reference to Fig. 2, the fire-box is out of contact with the hot-air chamber throughout its entire length, and by this arrangement the cold air will be caused to contact with every portion of the fire-box before it escapes, whereby rapid and effective heating thereof will be secured.

As an additional means of heating air and of utilizing all of the heat of the fire there is a heating-drum arranged within the air-chamber and above the fire-box and comprises three horizontally-disposed pipes 15, 16, and

.17, that are connected at their terminals by cross-pipes 18 and 19, and with the latter pipe is connected the flue 7. Arranged in the flue 7 between the pipes 15 and 19 is a damper 20, which when open will permit the products from the fire-box to pass directly out through the flue 7 to the chimney; but when closed the products of combustion will be forced to pass through the pipe 19 into the pipes 16 and 17, traverse the entire length thereof, enter the cross-pipes 18, and thence .into the pipe 15, whence they escape through the flue 7 above the damper 20. Each of the pipes 15, 16, and 17 project through the rear end of the hot-air chamber and are provided with suitable closures 21, which. may be removed to permit cleaning out of the pipes when necessary.

As usual, the front of the fire-box is provided with doors 22 and 23, the former opening into the fire-box proper and the latter into the ash-pit. Beneath. the door 23 and in the front 24 of the fire-box is an opening 25, through which air is admitted to the air- LOO space 11, and, if desired, this opening may be closed by a suitable door.

It will be seen from the foregoing description that by the arrangement herein disclosed that the highest and most rapid heating of the air can be effected with the minimum of fuel, inasmuch as the air will be caused to contact not only with the exterior of the fire-box, but also with the duplex drum arranged in the top of the hot-air chamber.

Furthermore, by the provision of the walls 4 shell constituting a hot-air chamber envelop-- ing said fire-box, said shell adapted to be detached from said fireboX, a heating-drum attached to and located in the shell, a flue at tached to and located in the shell and attaching with said heating-drum and adapted to engage the fire-box flue.

3. A furnace consisting of a fire-box, a shell constituting a hot-air chamber enveloping said firebox, said shell adapted to be detached from said fire-boX, a heating-drum attached to and located in the shell, a flue attached to and located in the shell attaching with said heating-drum at two altitudes, a damper located in said flue between the points of attachment with the drum, said flue adapted to engage and disengage the fire-box flue.

In testimony that I claimthe foregoing as 

